Reinforcing Steel Material

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uniaxialMaterial ReinforcingSteel $matTag $fy $fu $Es $Esh $esh $eult
< -GABuck $lsr $beta $r $gama > < -DMBuck $lsr < $alpha >>   
   
< -CMFatigue $Cf $alpha $Cd > < -IsoHard <$a1 <$limit> > >   
   

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$matTag integer tag identifying material
$matTag unique material object integer tag
$fy Yield stress in tension (see Figure 1)
$fu Ultimate stress in tension
$Es Initial elastic tangent
$Esh Tangent at initial strain hardening
$esh Strain corresponding to initial strain hardening
$eult Strain at peak stress
-GABuck Buckling Model Based on Gomes and Appleton (1997)
$lsr Slenderness Ratio (see Figure 2)
$beta Amplification factor for the buckled stress strain curve. (see Figure 3)
$r Buckling reduction factor

r can be a real number between [0.0 and 1.0]

r=1.0 full reduction (no buckling)

r=0.0 no reduction

0.0<r<1.0 linear interpolation between buckled and unbuckled curves

$gamma Buckling constant (see Figures 3 and 4)